AN EXPERIMENT TO ELUCIDATE THE MECHANISMS BEHIND HIGH-WAVE-RELATED FAILURE OF BACKSHORE SLOPES ON COASTAL ROADS IN CONSIDERATION OF CHANGES IN GROUND PROPERTIES

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  • HONMA Daisuke
    (国研)土木研究所 寒地土木研究所 寒地水圏研究グループ 寒冷沿岸域チーム
  • MIYATAKE Makoto
    (独)函館工業高等専門学校 社会基盤工学科
  • SASSA Shinji
    (国研)海上・港湾・航空技術研究所 港湾空港技術研究所 動土質研究グループ
  • KIMURA Katsutoshi
    室蘭工業大学大学院 くらし環境領域
  • SHIROZU Hajime
    熊本大学 自然科学研究科
  • EBIKO Tsubasa
    (独)函館工業高等専門学校 技術教育支援センター

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  • 地盤性状変化を考慮した海岸道路の後浜斜面の高波による破壊メカニズムの解明
  • ジバン セイジョウ ヘンカ オ コウリョ シタ カイガン ドウロ ノ ゴハマ シャメン ノ タカナミ ニ ヨル ハカイ メカニズム ノ カイメイ

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Abstract

 In this study, on-site surveys based on reports of damage to backshore slopes on coastal roads along the Sea of Okhotsk in Hokkaido were conducted, and an embankment fracture experiment with model high waves was performed in consideration of the survey results. In the experiment, ground with varying relative density and vane shear strength was used to simulate various states of soil suction dynamics. The results highlighted the collapse phenomenon that occurs when soil suction is reduced by high waves on a partially saturated and loosened slope, and scouring caused by high waves was observed on a partially saturated slope with medium-to-high density. The patterns of coastal road damage that follow changes in the relative density and degree of saturation seen in the field soils were clarified, and the mechanism behind high-wave-related failure on coastal roads was elucidated in relation to changes in soil properties. The volume of backshore slope collapse was also found to depend on the relative density and degree of saturation of the slope's soil.

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